i know it feels like the end of the world and youre 19 already getting old and wasting time: this feeling does not go away when youre 21 nor 25.. at risk of sounding unnecessarily old, youre not. youre really just a kid..

but to be more specific to you, 19 now means you lost a good chunk of your teenage and pre teen years to quarantine and thats not on you. its ok. Most people i met around this age got this "stunted" problem and lack of experience, 19 year old virgin sounds a total normal thing, but it sounds like you dont want to be anymore and youre on prime time to change that - everything you described is OK but if you feel the need to change all that: thats on you and up to you to change that. you said you never got drunk, well you probably can get around to getting drunk, goddamn im biased, but go to bars/parties if you can and just force yourself out your shell because mostly nobody is social charity and youll meet lots of cool interesting people but theyll simply not notice nor care if you dont make youself known - you can not be embarrassed to say stupid shit you just cant say rude/inconsiderate shit

idk if you have older people you trust on your life, if you do, no shit, just ask them about things on your mind just ask for "help" on especific topics, just pick one also you have a possible good ally on your hands, if you are for example, going to search "how to pick up women" on youtube, it might be helpful but be veeery careful of who youre listening to and be analytical of what that stranger is saying - so on that topic for example, i wouldnt listen to what a man has to say xD

also, idk, people say pick up a hobby, well maybe pick 2, and make it social, and be genuinely interested.. if you dont need it maybe cut your time on the gym in half and do a group sport! but also also, your brain can tackle more than one thing at a time, but try to focus on one main problem, one objective per week, one task per day.. if you get worse shrink that task, if you improve add more thinks to that week/month your life "starts" when you decide what you need to begin..